The WB is accurate enough that at 20 and 30 yards I won't shoot at the same bullseye with each shot. Too many times I've clipped my own fletching and or nock and I don't want the hassle/cost of replacement. At 40 yardsI'm sure it would do it just as often without my shooting errors involved.
Putting arrows side by side on a consistant basis is accurate regardless of the brand of the rest,bow,release. I've done the same with other rests as well, but the arrow would fall off of those once in awhile. So now I'm just as accurate and more confident as well.
There are some people who just hate the WB. I'm not sure why unless they couldn't get it to shoot for them. Maybe I'm one of the lucky thousands that shoot it well.